package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 *
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1、校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2、如果不符合返回错误信息
            return Result.fail("手机号格式不对");
        }
        //3、生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4、保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5、模拟发送验证码
        log.debug("验证码是：{}",code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1、校验手机号
        if(RegexUtils.isPhoneInvalid(loginForm.getPhone())){
            //2、如果不符合返回错误信息
            return Result.fail("手机号格式不对");
        }
        //3、从redis获取验证码，校验验证码
        String code = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + loginForm.getPhone());
        if(code == null || !code.equals(loginForm.getCode())){
            return Result.fail("验证码错误");
        }
        //4、根据手机查询用户
        User user = query().eq("phone", loginForm.getPhone()).one();
        //5、如果不存在就创建新用户
        if(user == null){
            user = createUserByPhone(loginForm.getPhone());

        }

        //6、保存用户到redis中
        //6.1、随机生成taken，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //6.2、将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> map = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        //6.3、存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,map);
        //6.4、设置有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //6.5、返回token
        return Result.ok(token);
    }

    private User createUserByPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        user.setCreateTime(LocalDateTime.now());
        user.setUpdateTime(LocalDateTime.now());

        save(user);
        return user;
    }
}
